ROCK TUMBLING GRANITE, Failure and success polishing softer rocks before and after!

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I decided to try polishing granite in my rock tumbler. Although a hard stone granite is softer than most of the stones we polish like agates or Jasper so it was an interesting experiment. I show the tumbling process briefly from start to finish showing the granite rocks before and after polishing.
I have also included a list of grits, grit quantities and times on the video.
After quickly showing the complete tumbling process, hopefully so that even beginners will understand what's going on.
I used three types of granite "Black Absoluto" "Blue Pearl granite" and "Emerald Pearl" all beautiful granites but oh what a difference in the finish of each type!
At the end of the video I explain why one granite tumbled and polished really well and why the other two were a disappointment.
I have made other rock tumbling videos, tutorials and product reviews, please check them out if you are a rock nut like me!
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Or check out these two great RU-vid channels:
meMiner / meminerrocks
Michigan rocks / jugglerguy1
All music from the RU-vid free music archive under creative commons license. Thank you.

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5 окт 2024

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Комментарии : 19

@gregwright6281 11 месяцев назад

I really enjoy your videos, they are very informative and helpful.

@thestonecraftingworkshop7490 11 месяцев назад

Glad you like them!

@colinmcnally2280 3 года назад

I could be wrong, but I seem to remember reading that "granite" and "quartz" worktops for kitchens etc aren't actually pure quartz and granite at all. I think I read that they crush an amount of the original rock down and then mix it with some sort of medium before moulding and machining the (now fabricated) slabs to size. If it's true, it could account for the way some of your tumbles came out. To back it up, I've tumbled beach granite many times myself, and it does seem pretty hard. Easily surviving 7 days in coarse with just a minor reduction in size (I've found). Of course it might depend on the make up of the granite as well, as it can have varying levels of elements in it.

@thestonecraftingworkshop7490 3 года назад

Hi Colin, I can assure you the granite I tumbled was real natural granite. The process you are talking about is generally called reconstituted or agglomerate, granite or marble bonded with resin. I too have successfully tumbled rocks from the beach that certainly look like granite but not any granite I have ever seen in slab form. So I wonder if these are granite or simply a form of chalcedony or basalt? You are right about the make up of the granite being a factor, I am sure the finer grained granites will tumble the best. thank you for the interesting input and thank you for watching.

@Lisa.Sparkman 3 года назад

Thanks so much for doing this work with the granite. I really like the look of it. I think if I pick some up and try it I might use the plastic from the beginning just to keep the stones from beating each other up right from the beginning.

@thestonecraftingworkshop7490 3 года назад

Hi Lisa, give it a go and please let me know how you get on, You may be right about the plastic beads, I will bear that in mind and try it out, perhaps on all softer stones. Keep safe and thank you for your thoughtful contribution.

@morrismurray3621 3 года назад

Didn’t think of granite! Looks good

@thestonecraftingworkshop7490 3 года назад

Hi Morris, As you saw I had mixed results but like all tumbling experiments it was interesting and fun. Always worth trying new things! All the best.

@RagnarRocks 2 года назад

Awesome video! Thanks for the tips! Always looking to improve my batches! Subbed!

@thestonecraftingworkshop7490 2 года назад

Thanks for the sub!

@yoopermann7942 3 года назад

thank you for the tips!!

@thestonecraftingworkshop7490 3 года назад

You are of course welcome, Thank you as always , all the best.

@spencerbrotherson9061 3 года назад

i've had horrible luck tumbling obsidian(only tried it once, and didn't really know what i was doing at the time), but i wonder if a tumbling recipe for something softer like obsidian would work better on your blue and green granite? You do have to use quite a lot of buffer material (apparently a lot more than i did) to keep the stones from smacking into each other quite as much in the tumbler and be really cautious on the rough grit stages, but once you get to the finer grit pre-polish and polish stages as long as you have enough buffer material you can let them run for quite a while, from what i understand

@thestonecraftingworkshop7490 3 года назад

Hi Spencer, my impression is that it is the granular structure of granite that is the problem, I suspect that on any stone like this (granular) we will have the same problem. I will try other things though and your idea is as good as anything I have come up with. I have only just started using the plastic beads as a buffer but so far I am impressed. I have polished Obsidian, or what I think is Obsidian but only as part of a general tumble of beach stones and they polished really well. I was thinking of polishing a black pebble load and will probably give it a try. Thank you for thoughtful the input and for watching. Keep tumbling and keep safe!

@morrismurray3621 3 года назад

Can I ask a side question. I get great polish with Cerium Oxide on faceting and Cabochons. Have you tried a final polish with a slurry of CeO, not a flood but more a paste in the barreling process?

@thestonecraftingworkshop7490 3 года назад

Hi Morris, I have not yet tried cerium oxide but when I do I will try your idea. I am already using less water generally. Thank you for the interesting input!

@morrismurray3621 3 года назад

@@thestonecraftingworkshop7490 I tried my first tumble using all your tricks of borax etc. Took 4 weeks of going through the grades of abrasive. Then I ended with a cerium oxide and plastic pellets polish, plus water to 40% full. After 3 days they came up very shiny! The cerium oxide seems to work very well

@cekajmeubudvi5334 3 года назад

When we are younger we tend to be impatient. As you get older you realise there is no real rush

@thestonecraftingworkshop7490 3 года назад

Hi, you are right, I now no longer worry how long a tumble lasts, fast or slow I am only interested in getting the best result I can. I am always cheered up by how thoughtful so many peoples comments are, so thank you.